Is it possible to miss your LH surge with OPK'S

Ch

I'm on CD18 and I haven't seen any surge in my OPK's. I've had a super close one, but then the next day the line was barely there. According to Glow, last month I ovulated on CD19 and I really did feel like I was... but that seems so late.Though, I haven't had any signs of ovulation like I usually do, I typically have cramps.